JCheckBox的问题检查了Java JList中的切换逻辑 [英] Trouble with JCheckBox checked toggle logic in a JList in Java

问题描述

我在切换JList中的复选框时遇到了麻烦，我希望单击某个项目以使复选框打勾，如果再次打勾，我希望将其切换为未打勾.我希望有可能在不使用ctrl或shift键的情况下勾选或取消勾选多个项目.

Hi I am having trouble with toggling a check box that is in a JList, I wish for when an item is clicked to have the check box tick, and if it is ticked again i want it to toggle to unticked. I want to have it possible to have multiple items to be ticked or unticked without the use of the ctrl or shift keys.

public class CustCellRenderer extends JCheckBox
implements ListCellRenderer
{
    boolean selected = false;

    void CustCellRenderer()
    {
        setOpaque(true);
        setIconTextGap(12);
    }

// allows a custom list cell rendering which will enable me to display an icon as well as filename
    @Override
    public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) 
    {
        JCheckBox checkBox = (JCheckBox)value;

        if (isSelected)
        {
            setBackground(list.getSelectionBackground());
            setForeground(list.getSelectionForeground());

            if (!selected)
            {
                selected = true;
                setSelected(selected);
            }
            else
            {
                selected = false;
                setSelected(selected);
            }
        }
        else
        {
            setBackground(list.getBackground());
            setForeground(list.getForeground());

            setSelected(selected);
        }

        setText(checkBox.getText());

        return this;
    }
}

这是我尝试向表中添加数据的方式，出于某种原因什么都没出现，有什么想法吗?

Here is how I am trying to add data to the table, nothing appears for some reason, any thoughts?

public void addDirectoryLabelsToList() 
{
    // clears all the previous labels from the listModel to ensure only labels
    // that refelect the current directory are shown
    for (int x = 0; x < tableModel.getRowCount(); x++)
        tableModel.removeRow(x);

    // iterate through the dirLabels and add them to the listModel
    for (JCheckBox j : dirLabels) 
    {
        Vector<Object> obj = new Vector<>();

        obj.add(Boolean.FALSE);
        obj.add(j.getText());

        tableModel.addRow(obj);
    }
}

推荐答案

JList允许自定义渲染器，但您也需要自定义编辑器.作为替代方案，考虑具有Boolean.class列的JTable，在此处所示.

JList allows custom renderers, but you'll need a custom editor, too. As an alternative, consider a JTable having a Boolean.class column, illustrated here.

附录:我已更改我的问题，请检查.

我不确定哪里出错了，但是我怀疑您模型的getColumnClass()方法没有为相关列返回Boolean.class.您可以将实现与与此相关的示例进行比较，然后发布

I'm not sure where things are going awry, but I suspect your model's getColumnClass() method does not return Boolean.class for the relevant column. You might compare your implementation with this related example and post an sscce.

这篇关于JCheckBox的问题检查了Java JList中的切换逻辑的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！